Method and a device for grinding twist drills



F. ERDELYI 2,972,839

Feb. 28, 1961 METHOD AND A DEVICE FOR GRINDING TWIST DRILLS 23 Sheets-Sheet 1 Filed March 10, 1958 INVENTOR fEEEA/a TRUE-4Y1 Feb. 28, 1961 F. ERDELYI 2,972,839

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METHOD AND A DEVICE FOR GRINDING TWIST DRILLS Filed March 10, 1958 25 Shets-Sheet s Fig. 20

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METHOD AND A DEVICE FOR GRINDING TWIST DRILLS Filed March 10, 1958 23 Sheets-Sheet 5 Fig.4

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Feb. 28, 1961 F. ERDELYI 2,972,839

METHOD AND A DEVICE FOR GRINDING TWIST DRILLS Filed March 10, 1958 23 Sheets-Sheet 9 LA 7 51mm: 47 T Feb. 28, 1961 F. ERDELYI 2,972,839

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